Reports out of Aleppo indicate that Syrian government troops launching an assault on the city have so far been unable to retake rebel-held neighborhoods there, despite the use of heavy weapons such as tanks and helicopter gunships.

Yesterday Syrian state media reported government victories in two Aleppo neighborhoods, but activists denied the reports, telling The Associated Press that there has been only "fierce shelling" and some fighting on the ground.

"The rebels are fighting with primitive weapons... We want weapons that we can stop tanks and planes with," SNC chief Abdelbasset Seida said in Abu Dhabi, the United Arab Emirates. "Our friends and allies will bear responsibility for what is happening in Aleppo if they do not move soon."

"If they continue this kind of tragic attack on their own people in Aleppo, I think it ultimately will be a nail in Assad's own coffin," Mr. Panetta told reporters.

"What Assad has been doing to his own people and what he continues to do to his own people makes clear that his regime is coming to an end. It's lost all legitimacy," he said, adding, "It's no longer a question of whether he's coming to an end, it's when."

Comments from residents in Damascus back up Panetta's claim. The government has reasserted control over the Syrian capital, but the success has come with a cost from the public, Reuters reports.

"To begin with I was with the regime, for sure," said Ahmed, from one of the southern suburbs where the Army, backed by helicopters and tanks, launched its counteroffensive. "But now, no, the regime must go. Take what they want with them, but they must go."

Abu Omar, for example, says he left his special forces unit while deployed to a rebel-held area of northwest Syria.

“They gave us orders to kill the people who don’t have a gun, but who just went out of their homes and shouted ‘freedom,’” says Abu Omar. “There were girls and little boys killed. I was just shooting in the sky. If we don’t shoot, they take us to jail, or kill us there.”

Likewise, Abu Hamza left the Syrian police after being ordered to shoot people as they left Friday prayers in the coastal town of Latakia after they began shouting “God is great.”

“My moral sense wouldn’t let me do it,” Abu Hamza recalls. He still carries his police ID card. “My father and brother go to mosque and shout in Aleppo every Friday. How could I shoot such people in Latakia? These people are family.”